Putting a rock in a hard place: Sculptures that require an amazing balancing act

These gravity-defying sculptures were created without glue or pins - just painstakingly balanced on one another.

Patient artist Adrian Gray, 44, spends hours scouring a nearby beach to select the ideal-sized rocks, boulders and pebbles to fit with each other.  

Adrian then arranges them in precarious positions by very carefully 'feeling' the balancing point of each rock - a process that requires supreme skill.   Read Here